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Focuses use an automatic belt tensioner which has no adjustment (as its spring loaded) if your belt is not tight enough replacement of the tensioner could be necessary..if you're asking due to a squealing problem check the pulley on the tensioner and the idler pulley..they are a common part to need changing
It depends if the Serpentine Belt is worn or not, i.e. cracked, glazed, dryed out. If it is good and the belt is still squealing than it may be a bad Belt Tensioner, which is not keeping the belt properly tensioned. (Loose Belt) Replacing the Belt will not solve the problem of the car running hot. You will need to fix the Electric Fan that is not working, because if you keep on running the car hot all the time you may blow the Head gasket to your engine which will cost you about $800-1100 dollars to repair.
changing a serpentine beltUsually, A serpentine belt system has a spring-loaded idler. Using the proper wrench, usually an 18mm, one can relieve the tension on the belt, making it relatively easy to change the belt. On most vehicles you will find a sticker either on the underside of the hood or somewhere in the engine compartment that shows how the belt goes on.
2.0L Engines See Figures 11, 12 and 13 The
accessory drive belt for 2.0L engines has no provision for manual belt
adjustment, since these engines use an automatic belt tensioner. Drive
belt slack is taken up by the automatic tensioner. Movement of
the automatic tensioner assembly during engine operation is not a sign
of a malfunctioning tensioner. This movement is the tensioner
self-adjusting and is required to maintain constant belt tension. The belt tensioner has a belt length indicator. If the indicator marks are not between the MIN and MAX marks, the belt must be replaced. Fig. 11: Drive belt routing-2.0L SOHC engine with A/CFig. 12: Drive belt routing-2.0L SOHC engine without A/CFig. 13: Drive belt routing-2.0L DOHC engine